Photocatalytic activity of doped titanium(IV)-oxide in degradation processes of some pesticides. [Doctoral dissertation] | Fotokatalitička aktivnost dopovanog titan(IV)-oksida u razgradnji nekih pesticida. Doktorska disertacija
2009
Šojić, D.
In the scope of this Ph.D. thesis activities of N-TiO2 (synthesized by wet and dry procedure) and TiO2 (rutile) doped with various amounts of Fe3+ (0.13-1.48 at. %) in degradation processes of herbicides MCPP and MCPA using visible light were studied. In addition, the efficiency of TiO2 (anatase) doped with various amounts of Fe3+ (0.71-1.80 at. %) was also tested for MCPP degradation. When comparing N-TiO2 (synthesized by wet procedure) and N-TiO2 (dry procedure), it was observed that in the latter case the catalyst efficiency was about two times higher. In the case for MCPP was also observed somewhat higher photocatalytic activity of N-TiO2 (synthesized by dry procedure) in comparison with TiO2. When activities of all three catalysts towards MCPA are compared, the results are very alike. During degradation of MCPP and MCPA it was observed that the rate is higher if TiO2 (rutile) was applied comparing to Fe-TiO2 and with increasing amount of Fe3+ photocatalytic activity mostly decreases. When TiO2 (anatase) doped with various amounts of Fe3+ (0.71 to 1.80 at. %) was applied fro MCPP degradation, the process was much slower than with undoped catalyst. Stability of clopyralid in different experimental conditions was also tested. In the case of clopyralid it was established that practically no degradation occurs in the presence of TiO2 (anatase) and N-TiO2 (dry procedure) with visible light and also with TiO2. Besides of that, by using TiO2 (rutile) and Fe-TiO2 as ohotocatalysts it was noted that increasing the concentration of Fe3+ from 0.13 to 1.27 at. % comes to increasing photodegradation rate of clopyralid.
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